A total of 64 suspicious cold cases dating as far back as the 1950s will now attract $1 million rewards after the McGowan Government overhauled WA’s reward system.

For 39 cases, the oldest of which is the 1958 murder of 26-year-old Barbara May Williams, this marks the first time any reward has been offered.

See every cold case that now attracts a $1 million reward in the list below.